Sheet-metal-bending machine.



V PATENTED-APR. 7, 1903.

c; T. TARPENNING. SHEET METAL BBNDING MACHINE.

APPLICATION FILED MAR. 10. 1902.

3 SHEETSSHEET 1.

N0 MODEL.

I a s T. Tarpenning Charle abtovmu No. 724,519. PATENTED APR. 7, 1903-.

' C. T. TARPENNING.

SHEET METAL BENDING MACHINE.

APPLIOATION FILED MAR. 10, 1902.

3 SHEETS-SHEET 2.

H0 MODEL.

.mm a n 5 Km mm 2 2 a O v 0 Lvw. w

mmwtoz Charles T Tarpenmng 2 7 1: "cams PETER$ co. PwoTo-ufnu. WASHPATENTED APR. 7, 1903.

v G. T. TARPENNING. SHEET METAL BENDING MACHINE.

APPLICATION FILED MA)? 10, 1902.

3 SHEETS-SHEET 3.

N0 MODEL.

amvem-boi Charles I. Tarpenning Q/vbbmwwo 1 5M w flw WZQWM,

UNITED STAT S PATENT OFFICE.

CHARLES T; TARPENNING, OF INDIANAPOLIS, INDIANA, ASSIGNOR OF ONE-HALF TOLOUIS KOSS, OF INDIANAPOLIS, INDIANA.

SHEET-METAL-BENDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 724,519, dated April 7,1903.

Application filed March '10, 1902. Serial No. 97,398. (No model.)

To all LU/I/O7Tl/ it may concern.

Be it known that I, CHARLES T. TARPEN- NING, a citizen of the UnitedStates, residing at Indianapolis, in the county of Marion and State ofIndiana, have invented a new and useful Sheet- Metal Bending Machine, ofwhich the following is a specification.

My invention relates to an improvement in machines forbending sheetmetal into desired forms, especially into saddle-pieces for roofs.

The object of my invention is to provide a machine easily and quicklyoperated and of such character that difierent forms may be Fig. 3 is asimilar section with the jaws in. closed position. Figs. 4 and 5 arepartial transverse sections of-modified forms of templets andcooperating jaws. Fig. 6 is a partial longitudinal section.

In the drawings, 7 7 indicate a pair of uprights or standards connectedby suitable longitudinal members '8 8, each of said uprights having anopening 9 formed therein near its upper end. Detachably secured touprights 7 adjacent openings 9 is a bar-templet 10, which is given across-section like that to which the sheet metal is to be bent. Inpractice the machine will be supplied with several templets of differentshapes, and any one may be secured in position.

Arranged immediately beneath templet 10 is a rod 11, which extendsbetween the two uprights 7. Pivoted upon rod 11 are several pairsoflevers 12 and 12. Levers 12 and 12 are provided with operating-arms 13and 13, respectively, which are preferably arranged at a slight angle totheir respective levers, as shown in Figs. 2 and 3. Pivoted to the endsof arms 13 and 13 are blocks 14 and 14, respectively. Arranged parallelto rod 11, at some distance below it, are two shafts l5 and 15, whichshafts are connected, so as to rotate in opposite directions, by meansof meshing gears 16 and 16'. Secured to shaft 15 is a series ofeccentrics 17, one adjacent each pair of levers l2 and 12, and securedto shaft 15 is a similarly-arranged series of eccentrics 17. Mountedupon each eccentric 17 is an eccentric-strap 18, each of which isconnected 'by a right-and-left screw 19 to one of the blocks 14, thestrap-arm thus formed by screw 19 and block 14 beingadjustable in lengthby the movement of the screw 19, the parts being held in adjustedposition by means of check-nuts 20. Each eccentric 17 is provided withan eccentric-strap 18, each of which is connected by a screw 19 with oneof the blocks 14:, the same being held in position by check-nuts 20.Secured to the outer ends of the several levers 12 is a jaw 21, whichmay be made of a single piece or built up of several pieces, as shown inthe drawings, the

said jaw extending the entire length of the templet l0 and of such formas to cooperate with one side of the templet, as clearly indicated inFig. 3. Secured to the outer ends of the levers 12 is a jaw 21, similarto jaw 21.

It is advisable that some means be provided to retain the sheet 22,which is to be bent, in engagement and alinement with the templet, andfor this purpose I arrange between adjacent pairs of levers, above rod11 and immediately beneath the lower edge of the templet, a support 23,provided along its middle with a groove 24, which conforms with theadjacent portion of the templet. Support 23 is provided at or near itsmiddle with a yoke 25, through which rod 11 passes. Mounted beneathyoke25 and pivoted upon shaft 15 is a lever 26, provided at its outerend with a roller 27, which lies upon a cam 28, secured to shaft 15. Cam28 is provided with one depression and the greater portion of itsperiphery is concentric with shaft 15. Pivoted to each lever 26 at itsmiddle is a block 29, which is connected to the adjacent yoke 25 by aright-and-left screw 30, held in adjusted position by means ofcheck-nuts 31. If support 23 be long, I secure to each end thereof ayoke 32, through which rod 11 may pass, and arrange in each of saidyokes' beneath the bar a spring 33, the said springs operating to keepthe support 23in alinement with templet 10.

Shafts 15 and 15 are driven simultaneously by any suitable means, suchas a pinion 3-1 and wheel 35, a clutch (not shown) being placed betweenthese parts, if desired, and operated by a handle 36.

In operation eccentrics l7 and 17 are correspondingly arranged upon theshafts 15 and 15' and in such manner that when turned to the positionshown in Fig. 2 the jaws 21 and 21 will have been thrown away from thetemplet and down substantially in line with the supports 23. In thisposition the cams 28 are brought with their shortest diameters oppositethe rollers 27. The operator then places a strip of the material to bebent between supports 23 and the templet 10. By operating a suitableclutch the shafts are then rotated, the first action being to bring thegreatest diameters of cams 28 opposite rollers 27, so as to throw levers26 upward and throw supports 23 close to the templet, and thus hold thestrip of material 22 between the support and the templet. The grooves 24in the supports cause a slight initial bending of the strip. Continuedoperation of the shafts swings levers 12 and 12 about rod 11 and throwsjaws 21 and 21 into the position shown in Fig. 3, the said jaws bendingthe sheet 22, so as to make it conform to the templet. A completerevolution of the shafts brings the parts to the initial positions, inwhich, if the machine be power-driven, the clutch may be automaticallythrown out in any manner well known in the art. then be withdrawnendwise from the templet through one or the other of openings 9 and theoperation repeated. Any desired form may be produced by substituting aproperlyformed templet.

I claim as my invention 1. In a bending-machine, the combination withthe main body, of a rod secured thereto, pairs of bell-crank leverspivotally mounted upon said rod, a pair of jaws secured to said levers,a pair of shafts, eccentrics secured to said shafts adjacent saidtlevers, eccentricarins mounted upon said eccentrics and each pivotallyconnected to the adjacent lever, means for rotating said shafts, and abar-templet mounted in position to cooperate with said jaws.

2. In a bending-machine, the combination with the main body, of atemplet carried thereby, a pair of swinging jaws arranged to cooperatewith said templet, a support ar- The bent strip may ranged beneath saidtemplet between the jaws, means for moving said support toward thetemplet, and means for swinging the jaws into coiiperation with thetemplet.

3. In a bending-machine, the combination with the main body, of a rodsecured thereto, pairs of levers pivotally mounted upon said rod, a pairof jaws one secured to each set of levers, a pair of shafts, eccentricscarried by said shafts, connections between said eccentrics and saidlevers, means for rotating said shafts, a templet mounted in position tocooperate with said .jaws, a support mounted beneath the templet andbetween the jaws, a lever pivoted upon one shaft, connections betweensaid lever and said support, and a cam carried by the other shaft andarranged to engage said lever.

4. In a bending-machine, the combination with the main body, of atemplet mounted thereon, a support mounted adjacent the forward edge ofsaid templet, means for moving said support toward and from the templet,a pair of jaws, and means for moving said jaws into cooperation with thetemplet.

5. In a bending-machine, the combination with the main body, of atemplet mounted thereon, a support mounted adjacent the forward edge ofsaid templet and having a portion corresponding in shape to an adjacentportion of the templet, means for moving the support into cooperationwith the templet so as to give the material an initial bend, a pair ofjaws, and means for moving said jaws into cooperation with the templet.

6. In a bending-machine, the combination with the main body, of a rodsecured thereto, pairs of levers pivotally mounted upon said rod, a pairof jaws one secured to each set of levers, a pair of shafts, eccentricscarried by said shafts, connections between said eccentrics and saidlevers, means for rotating said shafts, a templet mounted in position tocooperate with said jaws, a support mounted beneath the templet betweenthe jaws and having a portion corresponding in shape to an adjacentportion of the templet, a lever pivoted upon one shaft, connectionsbetween said lever and said support, and a cam carried by the othershaft and arranged to en gage said lever.

, CHARLES T. TARPENNING.

Witnesses:

ARTHUR M. H001), FRANK A. FAHLE.

